SNMPD crashes when configuring SNMP Traps

[Jarne St]

I am using Ubuntu vesion 18.04.3 and zabbix_server 4.0.12
I try to configure SNMP Traps.

I have followed the installation procedure as described here: https://zabbix.org/wiki/Start_with_SNMP_traps_in_Zabbix
I installed the following package to work with Ubuntu: perl, libsnmp-perl, libxml-simple-perl
And the deamons: snmp, snmpd, snmptrapd

But after the installation procedure, the snmpd refuses to start.
In my syslog I recieved hunderds of this lines:

Oct  4 09:38:38 PRIMERGY kernel: [ 2214.861793] audit: type=1400 audit(1570174718.476:11729): apparmor="DENIED" operation="create" profile="snap.net-snmp.snmpd" pid=1102 comm="snmpd" family="netlink" sock_type="dgram" protocol=0 requested_mask="create" denied_mask="create"
Oct  4 09:38:38 PRIMERGY kernel: [ 2214.861819] audit: type=1400 audit(1570174718.476:11730): apparmor="DENIED" operation="create" profile="snap.net-snmp.snmpd" pid=1102 comm="snmpd" family="netlink" sock_type="dgram" protocol=0 requested_mask="create" denied_mask="create"
Oct  4 09:38:38 PRIMERGY kernel: [ 2214.861867] audit: type=1400 audit(1570174718.476:11731): apparmor="DENIED" operation="create" profile="snap.net-snmp.snmpd" pid=1102 comm="snmpd" family="netlink" sock_type="dgram" protocol=0 requested_mask="create" denied_mask="create"
Oct  4 09:38:38 PRIMERGY kernel: [ 2214.861891] audit: type=1400 audit(1570174718.476:11732): apparmor="DENIED" operation="create" profile="snap.net-snmp.snmpd" pid=1102 comm="snmpd" family="netlink" sock_type="dgram" protocol=0 requested_mask="create" denied_mask="create"
Oct  4 09:38:38 PRIMERGY kernel: [ 2214.862047] audit: type=1400 audit(1570174718.476:11733): apparmor="DENIED" operation="open" profile="snap.net-snmp.snmpd" name="/proc/sys/net/ipv4/neigh/enp0s25/retrans_time_ms" pid=1102 comm="snmpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Oct  4 09:38:38 PRIMERGY kernel: [ 2214.862071] audit: type=1400 audit(1570174718.476:11734): apparmor="DENIED" operation="open" profile="snap.net-snmp.snmpd" name="/proc/sys/net/ipv6/neigh/enp0s25/retrans_time_ms" pid=1102 comm="snmpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Oct  4 09:38:38 PRIMERGY kernel: [ 2214.862094] audit: type=1400 audit(1570174718.476:11735): apparmor="DENIED" operation="open" profile="snap.net-snmp.snmpd" name="/proc/sys/net/ipv6/conf/enp0s25/forwarding" pid=1102 comm="snmpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Oct  4 09:38:38 PRIMERGY kernel: [ 2214.862116] audit: type=1400 audit(1570174718.476:11736): apparmor="DENIED" operation="open" profile="snap.net-snmp.snmpd" name="/proc/sys/net/ipv6/neigh/enp0s25/base_reachable_time_ms" pid=1102 comm="snmpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0

Has anyone an idea what exactly causes this error and how to resolve this?
Any guidance would be welcome!

[dimir]

It looks like a SELinux issue.

[Jarne St]

SELinux is disabled in my Ubuntu.

jarne@PRIMERGY: sestatus
SELinux status:                 disabled

Has this something to do with the configuration off snmpd?
If I look in the directory /etc/snmp the configuration file is missing ???

jarne@PRIMERGY: /etc/snmp$ ls
snmptrapd.conf

[dimir]

At least in my case I have snmpd.conf file:

$ dpkg -S /etc/snmp/snmpd.conf
snmpd: /etc/snmp/snmpd.conf

[Jarne St]

I will create it manually
cd /etc/snmp
touch snmp.conf
touch snmpd.conf

[Jarne St]

Hello,
I have solved my snmpd, but when I test it I get this:
(I used the (test) command from the tutorial: https://zabbix.org/wiki/Start_with_SNMP_traps_in_Zabbix)

jarne@PRIMERGY:~$ snmptrap -v 1 -c public 127.0.0.1 '.1.3.6.1.6.3.1.1.5.4' '0.0.0.0' 6 33 '55' .1.3.6.1.6.3.1.1.5.4 s "eth0"
Cannot rename /var/lib/snmp/snmpapp.conf to /var/lib/snmp/snmpapp.0.conf
Cannot unlink /var/lib/snmp/snmpapp.conf
read_config_store open failure on /var/lib/snmp/snmpapp.conf
read_config_store open failure on /var/lib/snmp/snmpapp.conf
read_config_store open failure on /var/lib/snmp/snmpapp.conf